Journal of Microbiology

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Genome information of the cellulolytic soil actinobacterium Isoptericola dokdonensis DS-3 and comparative genomic analysis of the genus Isoptericola: Yurim Bae , Sujin Lee , Kitae Kim , Hyun-Kwon Lee , Soon-Kyeong Kwon , Jihyun F. Kim; J. Microbiol. 2021;59(11):1010-1018. Published online November 1, 2021; DOI: https://doi.org/10.1007/s12275-021-1452-6

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The actinobacterial group is regarded as a reservoir of biologically active natural products and hydrolytic enzymes with the potential for biomedical and industrial applications. Here, we present the complete genome sequence of Isoptericola dokdonensis DS-3 isolated from soil in Dokdo, small islets in the East Sea of Korea. This actinomycete harbors a large number of genes encoding carbohydrate-degrading enzymes, and its activity to degrade carboxymethyl cellulose into glucose was experimentally evaluated. Since the genus Isoptericola was proposed after reclassification based on phylogenetic analysis, strains of Isoptericola have been continuously isolated from diverse environments and the importance of this genus in the ecosystem has been suggested by recent culturomic or metagenomic studies. The phylogenic relationships of the genus tended to be closer among strains that had been isolated from similar habitats. By analyzing the properties of published genome sequences of seven defined species in the genus, a large number of genes for carbohydrate hydrolysis and utilization, as well as several biosynthetic gene clusters for secondary metabolites, were identified. Genomic information of I. dokdonensis DS-3 together with comparative analysis of the genomes of Isoptericola provides insights into understanding this actinobacterial group with a potential for industrial applications.

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From lignocellulosic biomass to single cell oil for sustainable biomanufacturing: Current advances and prospects
Yu Duan, Limei Chen, Longxue Ma, Farrukh Raza Amin, Yida Zhai, Guofu Chen, Demao Li
Biotechnology Advances.2024; 77: 108460. CrossRef
A comprehensive review on strategic study of cellulase producing marine actinobacteria for biofuel applications
Ashwini John J, Melvin S. Samuel, Muthusamy Govarthanan, Ethiraj Selvarajan
Environmental Research.2022; 214: 114018. CrossRef

Hepatitis C virus infection stimulates transforming growth factor-β1 expression through up-regulating miR-192: Ji Hyun Kim , Chang Ho Lee , Seong-Wook Lee; J. Microbiol. 2016;54(7):520-526. Published online June 28, 2016; DOI: https://doi.org/10.1007/s12275-016-6240-3

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Abstract

The objective of this study was to determine the molecular mechanisms underlying chronic liver injury and fibrosis caused by hepatitis C virus (HCV). This study revealed that miR-192 expression was induced by HCV infection without affecting viral replication. However, viral-induced miR-192 up-regulated transforming growth factor-β1 (TGF-β1) expression in liver cells at transcriptional level. TGF-β1 stimulation by HCV-induced miR-192 was caused through ZEB1 down-regulation and TGF-β1 increased miR-192 level via positive feedback pathway. Increase in miR-192 expression by HCV infection was due to HCV core protein released and/or expressed by viral infection. TGF-β1 promoter activity was also increased by HCV core protein in liver cells. Taken together, HCV infection resulted in increased TGF-β1 transcription in hepatocytes through ZEB1 down-regulation by HCV core-mediated miR-192 stimulation. Importantly, miR-192 inhibition with anti-miR-192 rescued ZEB1 expression down-regulated by HCV infection, thus reducing the level of TGF-β1 expression increased by HCV infection in hepatocytes. These results suggest a novel mechanism of HCV-mediated liver fibrogenesis with miR-192 being a potential molecular target to ameliorate viral pathogenesis.

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